The Importance of Confined Sulfur Nanodomains and Adjoining Electron Conductive Pathways in Subreaction Regimes of Li-S Batteries

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Polysulfide dissolution into the electrolyte and poor electric conductivity of elemental sulfur are well-known origins for capacity fading in lithium-sulfur batteries. Various smart electrode designs have lately been introduced to avoid these fading mechanisms, most of which demonstrate significantly improved cycle life. Nevertheless, an in-depth understanding on the effect of sulfur microstructure and nanoscale electron transport near sulfur is currently lacking. In this study, the authors report an organized nanocomposite comprising linear sulfur chains and oleylamine-functionalized reduced graphene oxide (O-rGO) to achieve robust cycling performance (81.7% retention after 500 cycles) as well as to investigate the reaction mechanism in different regimes, i.e., S-8 dissolution, polysulfide conversion, and Li2S formation. In the nanocomposite, linear sulfur chains terminate with 1,3-diisopropyl-benzene are covalently linked to O-rGO. The comparison with control samples that do not contain either the capping of sulfur chains or O-rGO reveals the synergistic interplay between both treatments, simultaneously unveiling the distinct roles of confined sulfur nanodomains and their adjoining electron pathways in different reaction regimes.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2017-10
Language
English
Article Type
Article
Keywords

ELEMENTAL-SULFUR; HIGH-PERFORMANCE; GRAPHENE OXIDE; INVERSE VULCANIZATION; GRAPHITE OXIDE; CYCLE LIFE; LITHIUM; CATHODE; SEPARATOR; CARBON

Citation

ADVANCED ENERGY MATERIALS, v.7, no.19

ISSN
1614-6832
DOI
10.1002/aenm.201700074
URI
http://hdl.handle.net/10203/228467
Appears in Collection
EEW-Journal Papers(저널논문)
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